javaee IO流打印一行的方式

package Dayin;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.PrintWriter;

public class Demo04 {

    public static void main(String[] args) throws IOException {

        //打印流 的复制

        //1、数据源:BufferedReader+FileReader

        //2、目的地:PrintWriter+Println自动刷新功能

        FileReader fr=new FileReader("d:\\java\\ok.txt");

        BufferedReader br=new BufferedReader(fr);

        FileOutputStream fos=new FileOutputStream("e:\\java\\ok.txt");

        PrintWriter pw=new PrintWriter(fos,true);

        String str=null;

        while((str=br.readLine())!=null){

            pw.println(str);

        }

        pw.close();

    }

}